Hi 2_i, I appreciate all the comments and advise here. Also your remark is valuable to me, I read it as a serious warning and I appreciate that. It will be in my mind as I progress. I do not intend to die over there and I know very well that cold can kill. So I move cautiously, I come here for advise, I know new equipment usually breaks after three hours and I must plan for that. If I must back out I will not hesitate.